CVE-2023-4481
No exploitation reported by the sources we read.
- Published2023-09-01
- Fixed in20.4
- WeaknessCWE-20
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
An Improper Input Validation vulnerability in the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS). When certain specific crafted BGP UPDATE messages are received over an established BGP session, one BGP session may be torn down with an UPDATE message error, or the issue may propagate beyond the local system which will remain non-impacted, but may affect one or more remote systems. This issue is exploitable remotely as the crafted UPDATE message can propagate through unaffected systems and intermediate BGP speakers. Continuous receipt of the crafted BGP UPDATE messages will create a sustained Denial of Service (DoS) condition for impacted devices. This issue affects eBGP and iBGP, in both IPv4 and IPv6 implementations. This issue requires a remote attacker to have at least one established BGP session. Improper Input Validation, Denial of Service vulnerability in Juniper Networks, Inc. Junos OS (BGP, rpd modules), Juniper Networks, Inc. Junos OS Evolved (BGP, rpd modules) allows Fuzzing.This issue affects Junos OS: * All versions before 20.4R3-S10, * from 21.1R1 through 21.*, * from 21.2 before 21.2R3-S5, * from 21.3 before 21.3R3-S5, * from 21.4 before 21.4R3-S7 (unaffected from 21.4R3-S5, affected from 21.4R3-S6) * from 22.1 before 22.1R3-S4, * from 22.2 before 22.2R3-S3, * from 22.3 before 22.3R3-S1, * from 22.4 before 22.4R3, * from 23.2 before 23.2R2. Junos OS Evolved: * All versions before 20.4R3-S10-EVO, * from 21.2-EVO before 21.2R3-S7-EVO, * from 21.3-EVO before 21.3R3-S5-EVO, * from 21.4-EVO before 21.4R3-S5-EVO, * from 22.1-EVO before 22.1R3-S4-EVO, * from 22.2-EVO before 22.2R3-S3-EVO, * from 22.3-EVO before 22.3R3-S1-EVO, * from 22.4-EVO before 22.4R3-EVO, * from 23.2-EVO before 23.2R2-EVO.
Timeline
dates in UTC- 2023-09-0100:15CVE publishedNVD
- 2026-10-2319:23EPSS crossed 10 %FIRST EPSS
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-4481?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-4481?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD · CISA-ADP| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 20.4 | < 20.4 | 20.4 | NVD |
| 20.4 | = 20.4 | no fix published | NVD |
| 21.1 | = 21.1 | no fix published | NVD |
| 21.2 | = 21.2 | no fix published | NVD |
| 21.3 | = 21.3 | no fix published | NVD |
| 21.4 | = 21.4 | no fix published | NVD |
| 22.1 | = 22.1 | no fix published | NVD |
| 22.2 | = 22.2 | no fix published | NVD |
| 22.3 | = 22.3 | no fix published | NVD |
| 22.4 | = 22.4 | no fix published | NVD |
| 23.2 | = 23.2 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 20.4 | < 20.4 | 20.4 | NVD |
| 20.4 | = 20.4 | no fix published | NVD |
| 21.2 | = 21.2 | no fix published | NVD |
| 21.3 | = 21.3 | no fix published | NVD |
| 21.4 | = 21.4 | no fix published | NVD |
| 22.1 | = 22.1 | no fix published | NVD |
| 22.2 | = 22.2 | no fix published | NVD |
| 22.3 | = 22.3 | no fix published | NVD |
| 22.4 | = 22.4 | no fix published | NVD |
| 23.2 | = 23.2 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 23.2 | ≥ 23.2, < 23.2R2 | 23.2R2 | CISA-ADP |
| 22.4 | ≥ 22.4, < 22.4R3 | 22.4R3 | CISA-ADP |
| 22.3 | ≥ 22.3, < 22.3R3-S1 | 22.3R3-S1 | CISA-ADP |
| 22.2 | ≥ 22.2, < 22.2R3-S3 | 22.2R3-S3 | CISA-ADP |
| 22.1 | ≥ 22.1, < 22.1R3-S4 | 22.1R3-S4 | CISA-ADP |
| 21.4 | ≥ 21.4, < 21.4R3-S7 | 21.4R3-S7 | CISA-ADP |
| 21.3 | ≥ 21.3, < 21.3R3-S5 | 21.3R3-S5 | CISA-ADP |
| 21.2 | ≥ 21.2, < 21.2R3-S5 | 21.2R3-S5 | CISA-ADP |
| 21.x | ≥ 21.1R1, < 21.* | 21.* | CISA-ADP |
| 20.4 | < 20.4R3-S10 | 20.4R3-S10 | CISA-ADP |
1 more product in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update Juniper junos to 20.4
Advisories and patches
- kb.juniper.netVendor Advisory
- www.juniper.netVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Published
- 2023-09-01
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2023-4481?
Is CVE-2023-4481 actively exploited?
What is the CVSS score for CVE-2023-4481?
Hear about the next vulnerability in your software
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
No credit card required · No monthly cap on website lookups · 250 API requests/month
Go further
- Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
- Running this software? Vulnerability monitoring alerts you to new vulnerabilities in your products.
Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.